This thread explains far better than I can, and has part numbers:
http://www.pacificp.com/forum/viewtopic.php?t=2776&view=next&sid=eb66f51ca4260eb038b4eaf0fd471917
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http://www.pacificp.com/forum/viewtopic.php?t=2776&view=next&sid=eb66f51ca4260eb038b4eaf0fd471917
Sent from my XT912 using Tapatalk